Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa29b07d5be83bf…

MALICIOUS

PDF

75.1 KB Created: 2021-03-16 22:29:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c5f688cf9a39a76ca773a562f19b85f5 SHA-1: a068977e231bc039101b1fe27cf3b04670a298ac SHA-256: caa29b07d5be83bfb5540aa66c2c1a4d6e021c8b9346955aa96ef6d101907a8f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a social engineering attack to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/award?keyword=oxford+english+for+computing+teacher+s+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469643/normal_6050e40784f48.pdfIn PDF document text
    • http://usmileofficial.site/93761869791yl8cu.pdfIn PDF document text
    • http://o-karte-kopilka.com/gekanawibepudfqfo.pdfIn PDF document text
    • http://pesale.pro/what_is_the_addie_training_modelexn6b.pdfIn PDF document text
    • http://eurozone.pro/fluke_117_323_review43rgq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403689/normal_5fc6583cf076c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sajezife/kingo_android_root_software_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b14ca0-c478-4cb1-bbfd-35d42510d82f/does_a_letter_of_consent_to_travel_need_to_be_notarized.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7b2de9-3533-4462-ab20-6ba2431505a8/howls_moving_castle_book_synopsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d209109-2543-4d29-993e-80e95968243e/42138820358.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/garomofideremosofaludo.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/audi_a4_2004_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/912a8efb-fadd-4c13-846b-b964479e1980/passato_prossimo_o_imperfetto_esercizi_con_soluzioni.pdfIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_306a9c03e3df4a9d9c3b298de77ec321.pdf?index=trueIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_8e8e2305ac854e988c08bbae48aae3d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/the_program_suzanne_young_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/076aef77-0f48-499f-8211-34a486acd17d/tafelixekofotegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1d374ab-d703-4e22-b06c-7a80cdd3a6a3/92362585475.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/equifax_credit_report_app.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 5868 bytes
SHA-256: c3033c9966c5c3630562739ee677e22700051984405fa5a788a9e5659f24c0bf
font_01_sfnt_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 10704 bytes
SHA-256: a054daa99b3738cf4b031efc2f3f71772bccc6fa6e9724ea789f17b8ed3db7e4

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